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Service Manual
21:6 INTERLOCK HARDWARE
This error code is generated by the MCU for drum motor.
The MCU must be powered with 230V / 50 or 60 Hz on the interlock input in order to drive the motor. The interlock cir-
cuits in the MCU have been split into two channels so that a component error in MCU cannot give a false confirma-
tion that the door is locked. These two channels are checked against each other. If this check gives an incorrect
result this error code will be shown.
Possible cause:
The reason for this error code being activated can be attributed to an error in the interlock circuits in motor control.
Recommended actions:
1. Replace MCU.
21:7 LOW DC VOLTAGE
This error code is generated by the MCU for drum motor.
The MCU constantly measures the voltage over the mains input. If the voltage is below a predefined limit, the MCU
will shut off the current to the motor. Once the motor has stopped (= the tacho sensor indicates that the motor is sta-
tionary), the MCU checks to see whether the input voltage is still low. If it is, this error code is shown. The reason for
this error code being activated can be low mains voltage or that the machine’s on/off switch has been operated in an
unsuitable manner.
Further information can be obtained by studying the contents of MCU ERROR LOG 1 and MCU ERROR LOG 2:
• UNDERVOLTAGE 2 (specifies how many times this error code has been active).
• UNDERVOLTAGE 1 (specifies how many times the voltage has dropped below the limit. The difference between
undervoltage 1 and undervoltage 2 indicates how many times there has been an undervoltage 1 without it being
confirmed when the motor has stopped).
• LAST FAULT CODE N/8 (shows the 8 latest error codes) Undervoltages can be registered even during normal op-
eration. Consequently, a small number of registrations need not mean that there is an error in the MCU.
Recommended actions:
1. Check that the supply voltage is stable and never drops below nominal voltage - 10%.
2. Check the fuses and cables.
3. Check the supply voltage in the network cabling and at the MCU in the machine.
21:8 HIGH DC VOLTAGE
This error code is generated by the MCU for drum motor.
The MCU constantly measures the voltage over the mains input. If the voltage exceeds a predefined limit, the MCU
will shut off the current to the motor. Once the motor has stopped (= the tacho sensor indicates that the motor is sta-
tionary), the MCU checks to see whether the input voltage is still high. If it is, this error code is shown.
Recommended actions:
1. Check incoming AC voltage.
21:12 NO PARAMET. SET IN MCU
This error code is generated by the MCU for drum motor.
The MCU contains several different parameter sets for different motors. During power up the control system checks
that the correct parameter set digit is written into the MCU. If not, the control system will write down the parameter
set digit defined in fixed configuration.
If the MCU discovers that no parameter set value is written down into the MCU, the error code will be shown.
Possible causes:
This can be caused by wrong software in CPU or wrong MCU for the current machine.
Recommended actions:
1. Make sure correct machine software and correct MCU are used.
21:13 UNBALANCE
This error code is generated by the MCU for drum motor.
The MCU monitors the unbalance switch status. If the status is active already at program start, this error code is
shown.
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